Henry fownes



(No Model.)

H. & G. E. P OWNES.

CRANK SHAFT.

Patented Nov. 11, 1890.

' round and the webs may be secured against UNITED STATES PATENT OFFICE.

HENRY FO\VNES, OF NEl/VCASTLE-UPON-TYNE, AND GEORGE EDlVARD FOIVNES, OFCARDIFF, ENGLAND.

CRANK-SHAFT.

SPECIFICATION forming part of Letters Patent No. 440,555, dated November11, 1890.

Application filed July 16, 1889. Serial No. 317,653. (No model.)Patented in England December 20, 38 1 1 To all w/wm it may concern;

Be it known that we, HENRY FOWNES, engineer, and GEORGE EDWARD Fownns,engineer, subjects of the Queen of the United Kingdom of Great Britainand Ireland, residing, respectively, at Newcastle-upon l yne, in thecity and countyof the same name, and at Cardiff, South \Vales, both inthe said Kingdom of Great Britain and Ireland, have invented new anduseful Improvements in Built Crank-Shafts and in Repairing Solid Shafts,(for which we have obtained Letters Patent in Great Britain, No. 17,513,dated December 20, 1887,) of which the following is a specification.

Our invention relates to improvements in fitting and securing crank-pinsin the webs of what are known as built crank-shafts, in which thecrank-pin forms a separate piece from the Webs, and is designedspecially to enable such shafts to be adapted to existing engines, inwhich provision as to clearance is provided only for solid shafts, andis not suflieient to allow for the introduction of a pin separate fromthe webs, as ordinarily fitted, but it is equally suitable for crank--shafts of new engines, in which it reduces the length over the end ofweb, and is also appli cable in repairing a broken crank-pin of a solidshaft, thus securing the advantage of a built shaft, as to the separatepin, and facility for fitting a spare pin.

According to our invention we term the pin with a collar at each end,concentric to the axis of the pin,whieh collars are sunk or partiallysunk into the inner faces of the webs, and beyond each collar the pinextends through the web with its axis eccentric to the main axis towardthe center of the shaft.

Although we prefer, and propose generally to adopt, collars on the pin,as giving a better side bearing for the connecting-rod brasses, they mayin some cases be dispensed with and the pin itself recessed into thewebs. Thus the pin is firmly secured against turning spreading by keysor by nuts, or the webs may be shrunk onto the pin, while there issufficient material in the Web outside the pin to secure the requisitestrength, and a crank with a pin thus fitted into the webs is no longerfrom center of shaft over the websthan a solid crank.

In the drawings, Figure 1 shows a crankshaft with three cranks, thecenter crank being in section, made according to our invention, the webs\V IV and the pin 1?, with concentric collars G C and eccentric ends P,forming separate parts. Fig. 2 shows one crank, partly in section,shrunk onto the main pieces of the shaft and a key inserted. Fig. 3shows an end View of the outer face of one of the webs \V withsemicircular ends, the dotted lines indicating the outline of webrequired to receive a separate pin, according to the ordinaryconstruction. Fig. at shows a section of the two webs IV W, with the pinP, having concentric collars O C, and with its eccentric ends 1?, ofnearly the same diameter as the middle, as in cases where greaterstrength may be required; and Fig. 5 is an end view of the outer face ofone of the webs IV, also with semicircular ends, the dotted lines, asbefore, indicating the outline of an ordinary web with loose crank-pinP. Fig. 6 shows a shaft in which the webs \V V are solid upon the mainshaft S with a pin P without collars, the body of. the pin P beingrecessed into the inner faces of the webs IV V- and the eccentric ends Pof the pin passing through the webs and being secured therein by nutsNwith recessed necks, into which a set-bolt may be inserted to preventthem from working loose.

In Fig.1 the webs W W are secured tocollars 0r coupling-flanges F on themain pieces of the shaft S by bolts 13, the nuts N having collarsrecessed into the webs W T, but except in combination with the mode ofinserting the crank-pin P, we do not consider the securing of the webson the shaft as any part of our invention, as the webs may even in somecases be formed solid upon the shaft. It will be seen that the pin P isperfectly secured against turning round in the webs IV IV, and the keysK, Figs. 1, 2, 3, 4E, and 5, are inserted merely to prevent any tendencyof the outer ends of the webs V W to spread laterally, the nuts N* onFig. 6 serving the same purpose.

The shortening of the cranks and consequent saving in weight is aconsiderable advantage, even if there is no question of clearances, anda solid crank with a broken pin can have a new pin fitted according toour invention without weakening the webs.

What We claim as our invention, and desire to secure by Letters Patent,is

1. In a built-up crank-shaft, the combination, with crank-Webs, of acrank-pin having its two end portions integral with and arrangedeccentrically to its central portion toward the main center line of theshaft, said crank-pin being secured in said webs, substantially asdescribed.

2. In a built-up crank-shaft, the combination, with crank-Webs eachformed with a hole therethrough for a crank-pin, and with a circularrecess eccentric to said hole, of a crankpin having its end portionscircular in crosssection, but arranged eccentrically to and integralwith its central portion, said end portions being secured in the holesin said Webs and the ends of the said central portion fitted in saidrecesses, substantially as herein described.

3. In a built-up crank-shaft, the combination, with crank-webs eachformed with a hole therethrougli for a crank-pin, and with a circularrecess eccentric to said hole, of a crankpin having its end portionscircular in crosssection, but arranged eccentrically to and integralwith its central portion, and provided with collars concentric with thecentral portion or body, said end, portions being secured in the holesin said webs, and said collars being fitted in said recesses,substantially as herein described.

4. In a built-up crank-shaft, the combination, with crank-Webs W W, eachformed with a hole therethrough, and with a recess eccentric to saidhole, of a crank-pin having a central portion P, the ends of which fitin said recesses, and end portions P, that are eccentric to the centralportion and are secured in the holes in said Web, the common axis ofsaid eccentric end portions being arranged nearer the axis of thecrank-shaft than that of the central portion, substantially as hereindescribed, for the purpose set forth.

In testimony whereof we have signed our names to this specification inthe presence 0 two subscribing Witnesses; I

HENRY FOWNES. GEORGE EDWARD FOWNES.

Witnesses:

HENRY ARTHUR PINCOMBE, EVAN RICHARD EVANS.

